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POTroubleshooting VC++ DLL in VB.Net
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  1. POTroubleshooting VC++ DLL in VB.Net
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    copied!<p>I'm trying to make a solution in Visual Studio that consists of a VC++ DLL (C++/CLI) and a VB.Net application. To figure this out, I created a VC++ Class Library project, with the following code (I removed all the junk the wizard creates):</p> <p>mathfuncs.cpp:</p> <pre><code>#include "MathFuncs.h" namespace MathFuncs { double MyMathFuncs::Add(double a, double b) { return a + b; } } </code></pre> <p>mathfuncs.h:</p> <pre><code>using namespace System; namespace MathFuncs { public ref class MyMathFuncs { public: static double Add(double a, double b); }; } </code></pre> <p>This compiles quite happily. I can then add a VC++ console project to the solution, add a reference to the original project for this new project, and call it as follows:</p> <p>test.cpp:</p> <pre><code>using namespace System; int main(array&lt;System::String ^&gt; ^args) { double a = 7.4; int b = 99; Console::WriteLine("a + b = {0}", MathFuncs::MyMathFuncs::Add(a, b)); return 0; } </code></pre> <p>This works just fine, and will build to test.exe and mathsfuncs.dll.</p> <p>However, I want to use a VB.Net project to call the DLL. To do this, I add a VB.Net project to the solution, make it the startup project, and add a reference to the original project. Then, I attempt to use it as follows:</p> <pre><code>MsgBox(MathFuncs.MyMathFuncs.Add(1, 2)) </code></pre> <p>However, when I run this code, it gives me an error: </p> <blockquote> <p>Could not load file or assembly 'MathFuncsAssembly, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format.</p> </blockquote> <p>Do I need to expose the method somehow? </p> <p>I'm using Visual Studio 2008 Professional.</p>
 

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